From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hollis Blanchard Subject: Re: [patch] fold struct vcpu_info into CPUState Date: Mon, 27 Oct 2008 11:02:21 -0500 Message-ID: <1225123341.5543.6.camel@localhost.localdomain> References: <48E0F318.7050303@sgi.com> <5d6222a80810131524s7ec55bfyb296085c6c2ac4af@mail.gmail.com> <48F8AF00.1050304@sgi.com> <5d6222a80810171427m252a1cf9he711ab247ae84530@mail.gmail.com> <4901F083.3070006@sgi.com> <1224875457.9634.63.camel@localhost.localdomain> <49058E60.6080507@sgi.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: Glauber Costa , kvm@vger.kernel.org, kvm-ia64@vger.kernel.org To: Jes Sorensen Return-path: Received: from e6.ny.us.ibm.com ([32.97.182.146]:51616 "EHLO e6.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751236AbYJ0QCX (ORCPT ); Mon, 27 Oct 2008 12:02:23 -0400 In-Reply-To: <49058E60.6080507@sgi.com> Sender: kvm-owner@vger.kernel.org List-ID: On Mon, 2008-10-27 at 10:48 +0100, Jes Sorensen wrote: > Hollis Blanchard wrote: > > It looks like qemu is actually switching threads when this happens... > > I'm not sure what the current state is of qemu/KVM threads... I think we > > have 1 thread per vcpu, plus 1 IO thread? If that's right, maybe > > current_env isn't being initialized in the IO thread; I only see that > > happening inside ap_main_loop(), which is the vcpu thread. > > > > Hmmm, this is bizarre. If it was the IO thread dieing because of this > I would expect the same to happen on ia64. Could you try and add a test > in the code to find out which thread you are when you die, and maybe > check for current_env being valid? I tested in gdb, and I can confirm that a) current_env was initialized in one thread, and then used in another, and b) current_env was NULL (invalid) when it was used. Are you using virtio on ia64? -- Hollis Blanchard IBM Linux Technology Center